/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.njxxted.activiti.modules.process.rest.editor.model;

import com.njxxted.activiti.common.util.BpmnBuilderUtil;
import com.njxxted.activiti.modules.process.cmd.BpmnModelCmd;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import org.activiti.editor.constants.ModelDataJsonConstants;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.repository.Model;
import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.PNGTranscoder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;

/**
 * @author Tijs Rademakers
 */
@RestController
@RequestMapping("/service")///service与上面app-cfg.js中保持一致）
public class ModelSaveRestResource implements ModelDataJsonConstants {

    private static final Logger LOGGER = LoggerFactory.getLogger(ModelSaveRestResource.class);

    @Resource
    private RepositoryService repositoryService;

    @Resource
    private ObjectMapper objectMapper;

    @RequestMapping(value = "/model/{modelId}/save", method = RequestMethod.PUT)
    @ResponseStatus(value = HttpStatus.OK)
    public void saveModel(@PathVariable String modelId, HttpServletRequest request) {
        try {
            BpmnModelCmd bpmnModelCmd = BpmnBuilderUtil.buildBpmnCmd(request);
            String json_xml = bpmnModelCmd.getJsonXml();
            JsonNode jsonNode = objectMapper.readTree(json_xml);
            JsonNode properties = jsonNode.get("properties");
            JsonNode process_id = properties.get("process_id");

            Model model = repositoryService.getModel(modelId);
            ObjectNode modelNode = objectMapper.createObjectNode();
            modelNode.put(ModelDataJsonConstants.MODEL_NAME, bpmnModelCmd.getName());
            modelNode.put(ModelDataJsonConstants.MODEL_REVISION, model.getVersion());
            modelNode.put(ModelDataJsonConstants.MODEL_DESCRIPTION, bpmnModelCmd.getDescription());
            model.setMetaInfo(modelNode.toString());
            model.setKey(process_id.asText());
            model.setName(bpmnModelCmd.getName());
            model.setCategory(bpmnModelCmd.getCategory());

            repositoryService.saveModel(model);
            repositoryService.addModelEditorSource(model.getId(), json_xml.getBytes(StandardCharsets.UTF_8));

            InputStream svgStream = new ByteArrayInputStream(bpmnModelCmd.getSvgXml().getBytes(StandardCharsets.UTF_8));
            TranscoderInput input = new TranscoderInput(svgStream);
            PNGTranscoder transcoder = new PNGTranscoder();
            // Setup output
            ByteArrayOutputStream outStream = new ByteArrayOutputStream();
            TranscoderOutput output = new TranscoderOutput(outStream);
            // Do the transformation
            transcoder.transcode(input, output);
            final byte[] result = outStream.toByteArray();
            repositoryService.addModelEditorSourceExtra(model.getId(), result);
            outStream.close();

        } catch (Exception e) {
            LOGGER.error("Error saving model", e);
            throw new ActivitiException("Error saving model", e);
        }
    }
}